Action of an algicide from a cyanobacterium, Oscillatoria laetevirens, on photosystem II.
Indian J Exp Biol
;
2001 Dec; 39(12): 1268-73
Article
in English
| IMSEAR
| ID: sea-57662
ABSTRACT
Oscillatoria laetevirens produces an algicide, named oscillatorin (OS), which inhibits growth of higher plants. Effect of purified oscillatorin and some 'urea-triazine type' herbicides was studied on photosystem II activity and composition of pigment protein complex in spinach thylakoid membrane. For oscillatorin the I50 at 10 microg chlorophyll concentration, inhibitor constant (Ki), specific binding sites and Hill coefficient were calculated to be 1.45, 0.15, 2.3 and 0.2 microM respectively. Metribuzin and oscillatorin affected towards the donor side and brought about identical changes in polypeptide composition of PSII complex. Further, metribuzin and atrazine exerted antagonistic and synergistic responses on oscillatorin action. Some of these parameters were also studied on weed plants to assess upon the weedicidal potential of oscillatorin.
Full text:
Available
Index:
IMSEAR (South-East Asia)
Main subject:
Organic Chemicals
/
Cyanobacteria
/
Photosynthetic Reaction Center Complex Proteins
/
Light-Harvesting Protein Complexes
/
Photosystem II Protein Complex
/
Electrophoresis, Polyacrylamide Gel
/
Herbicides
Language:
English
Journal:
Indian J Exp Biol
Year:
2001
Type:
Article
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